Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b90309f03673de8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 13:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 59daf940bf7c40195e27b95f9e33ef37 SHA-1: 9a1f90533245114a8eec3027b200599fae655f5d SHA-256: 6b90309f03673de820d8a1bfd731c2b8d45db5308500c08718946d2e7c01b415
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=house+of+flying+daggers+online PDF link annotation
    • http://waycreon.net/bhaskar/yii/upload/files/nudosuxofufijofu.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/kinirevaj.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/21446641955.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-7/20210907034540107897.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/tuzapupoza.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/17265475331.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/45228622915.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132949bbb8e2---fujozasetela.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/nefud.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/32007172082.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/tidojax.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/89656299964.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/12212017590.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631711243.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/pomimemeluziroje.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/notakudaxa.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/jujusetomifivinomi.pdfIn PDF document text
    • http://generaldistco.com/images/file/seruwolakege.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/rufotajinafixodobetogej.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/12469942384.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/tuvitobedaneb.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/51208570426.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 10636 bytes
SHA-256: 0a23c93ab20ac342e47cfeb6287b7b2bb9b6391dc7c1eb6294def10c6c385073
font_01_sfnt_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 16568 bytes
SHA-256: 90644c28e1cf4b605a335df670be5f47753e2d85642c4600e5f28fc838987987

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